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A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.
Programs to remove SIM lock restrictions are available, but are not supported by Apple, and most often not a permanent unlock – a soft unlock, [217] which modifies the iPhone so that the baseband will accept the SIM card of any GSM carrier. SIM unlocking is not jailbreaking, but a jailbreak is also required for these unofficial software unlocks.
While the iPhone was initially sold in the U.S. only on the AT&T network with a SIM lock in place, various hackers found methods to bypass that SIM lock. [119] More than a quarter of first-generation iPhones sold in the U.S. were not registered with AT&T. Apple speculated that they were likely shipped overseas and unlocked, a lucrative market ...
George Hotz developed the first iPhone unlock, which was a hardware-based solution. Later, in 2009, he released a jailbreaking tool for the iPhone 3G and iPhone 3GS on iPhone OS 3.0 called purplera1n, [49] and blackra1n for iPhone OS version 3.1.2 on the 3rd generation iPod Touch and other devices. [50]
Medium (Snapdragon). Only any phones in support list are possible to unlock Snapdragon-powered OPPO phone. [6] Any phones that's not in support lists is still possible if using paid tool also known as UnlockTool. Without paid tool, It would be impossible to unlock. Unlocking is possible on some mediatek SoCs via MTKClient.
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